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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-28); not revised (00-08-04).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera vaccinii (Schwein.) Cooke & Peck; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe vaccinii Schwein. Type: Erysiphe vaccinii Schwein.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [318-319] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada, Alaska, generally distributed). Country or state(s): Alaska (USA), New Brunswick (Canada), Ontario (Canada), Idaho (USA), Oregon (USA), Washington (USA), Wyoming (USA), Illinois (USA), Wisconsin (USA), Connecticut (USA), Maine (USA), Massachusetts (USA), Michigan (USA), New Hampshire (USA), New Jersey (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Rhode Island (USA), Vermont (USA), West Virginia (USA), California (USA), Alabama (USA), Delaware (USA), Florida (USA), Georgia (USA), Maryland (USA), North Carolina (USA), Tennessee (USA), Virginia (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Vaccinium pennsylvanicum Lam.; Vaccinium, Ericaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.07)-.09-.13-(.15) mm in diam.. Margin: External filaments present (horizontally spread); recurved (occasionally slightly) or straight (mostly, or knob-like), 1.5-7 µm long, 5-10 µm in diameter, hyaline or pigmented (sometimes at the base), numerous, 5-22 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose, thin or moderatly thick (towards the base when mature), ramified, dichotomously branched (3-5(-6) times, branchings rather close, compact, regular, sometimes widely forked, rarely forked near the base or apex deeply cleft, tips of the ultimate branchlets mostly straight or knob-like, occasionally slightly recurved), aseptate or septate (0-1-septate).

Asci: (3)-5-8 asci per ascocarp, not stipitate or indistinctly stipitate, 45-60-(70) µm long, 25-40-(50) µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6-(8) per ascus, ellipsoid or ovoid, (14)-18-22-(24) µm long, 9-13 µm wide; septa absent.

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